Question

The atrioventricular (AV) valves are closed ________.

when the ventricles are in systole

when the ventricles are in diastole

by the movement of blood from atria to ventricles

while the atria are contracting

Answer 1

Function of AV valve is to allow the flow of blood from atria to ventricles and to prevent the back flow of blood from ventricle to atria.

Valve is open when pressure in atria is more than ventricles (during venticular diastole and atrial systole) and it is closed when pressure in ventricles is more than atria ( during ventricular systole)

AV valve remain open during movement of blood from atria to ventricles.

So answer will be the first option as explained in paragraph two.